Microwave synthesis of Fe-doped anatase TiO2/N-doped modified graphene composites with superior sodium storage properties

摘要

Exploring advanced anodes for Na-ion batteries (NIBs) remains challenging. This paper reports a simple solgel-microwave two-step route to synthesize Fe-doped anatase TiO2/N-doped modified graphene (FTiO2/NRGO) composites with superior performance in NIBs. The doping of low-valence Fe3+ can generate vacancies in the oxygen sub-lattice of anatase TiO2, thereby improving electronic conductivity. Furthermore, the introduction of N-doped graphene (NRGO) can further enhance the structural stability of the composites and facilitate the ions/Na+ diffusion. With this strategy, the FTiO2/NRGO electrode delivers outstanding reversible capacities (161.3 mAh g(-1) at 0.1 A g(-1) over 300 cycles) and superior rate performance for NIBs (102.1 mAh g(-1) at 2 A g(-1)).